:root { --bg: #f7f7f5; --fg: #1d1d1b; --muted: #66665f; --card: #fff; --line: #e2e2dc; --accent: #1a5fb4; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #161615; --fg: #ececea; --muted: #a3a39c; --card: #20201e; --line: #34342f; --accent: #8ab4f8; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif; }
main { max-width: 640px; margin: 0 auto; padding: 48px 16px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 28px; }
h1 { font-size: 1.5rem; margin: 0 0 8px; }
h2 { font-size: 1.1rem; margin: 24px 0 8px; }
p, li { color: var(--fg); }
.muted { color: var(--muted); font-size: .9rem; }
a { color: var(--accent); }
.button { display: inline-block; background: var(--accent); color: #fff; padding: 10px 18px; border-radius: 8px; text-decoration: none; font-weight: 600; }
@media (prefers-color-scheme: dark) { .button { color: #111; } }
code, pre { font: 13px/1.45 ui-monospace, SFMono-Regular, Menlo, monospace; }
pre { background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 12px; overflow-x: auto; }
footer { margin-top: 24px; }